Union which permits misalignment



1953 D. J. PARMESAN 2,561,955

UNION WHICH PERMITS MISALIGNMENT Filed Oct. 7, 1948 FIG. I

FIG. 2

INVENTOR.

ATTORNEY Patented Dec. 8, 1953 7 if ES v I UNroN wrnen PERMITSMI'SALIGNMENT Daniel J. Parmesan, Houston, Tex., assignor, by A mesneassignments, to Chiksan Company, .Brea, e. qGaliL, a. corporation ofCalifornia.

.. Application October '1, 1948, se ialn gsazsc 1 Claim. (01. 285-422))This invention relates mits misalignment.

7 object of the invention is to provide a union la union which peror thecharacter described whereby sections of pipe or tubing may be quicklyconnected or diseonnected with a novel sealing arrangementbetweenf'the'coupl-ing members to prevent leakage of fiuid between saidcoupling members either as a result of pressure or suction.

Another object of the invention a union of the character described whichincludes not only a metal to metal seal between the cou- F ing membersbut also a resilient seal ring em- "bodied therein which veryeffectively-seals the joint between the coupling members irrespective ofthe intensity of the pressure or suction.

The type of union herein described has been designed primarily as apressure seal to prevent the escape of pressure fluid from the lineconnected by the union although it is also effective as a suction seal,that is it forms an effective seal is to provide form a metal tometaljoint when the coupling members are; assembled.

The inner :end;of the coupling member 2 is internally enlarged and the.inner end of the coupling member! telescopes into said enlarged end.

There isa' clamp nut! havingcoarse internal threads l0 adapted tointermesh with the threads I and also having antinternal annular flangell whichfits closely over the section .1 and which is engageable withtheshonlder 3., when the. threads are screwed home, to clamp the facingends of the coupling members in abutting relation.

The inside diameter of the threads. ['0 is somewhat larger. thantheoutside diameter of the shoulder 3 so that the clamp nut 9 may befitted over the coupling member I and the threads [0 screwed onto thethreads 1.

The facing sides of the bearings surfaces 4 and I 8 converge outwardlyand the seal ring 6, in the even though the pressure within the line maybe merals I and 2 designate, respectively, the coupling members of aunion whose outer ends are internally threaded for the connection ofsections of pipe thereto. The term coupling member as used herein ismeant to embrace not only those illustrated but also such other membersas blanking caps, reducing members, etc.

The inner end of the coupling member I is formed with an externalannular shoulder 3 and beyond said shoulder, toward the inner end of thecoupling member, said member has an external annular bearing surface 4which is curved.

outwardly, that is toward the inner end of said member, all the Wayaround.

The extreme inner end of the coupling member l is provided with a. halfround. groove 5 all the way around to receive a resilient O-ring 6.

The abutting end of the coupling member 2 is outwardly thickened andformed with coarse external threads I and has an inside outwardlyflared, plane annular face 8 against which the opposing bearing surface4 fits closely so as to groove 5, contacts with the face, or bearingsurface 8, at all times but when said seal ring 6 is subjected tointernal pressure it will be forced outwardly between said convergingsurfaces to form a very tight seal and, likewise, in case of .lowpressure in the line connected by the union member la has a plane radialbearing surface 4a instead of the bearing surface 4 shown in Figure 1and this plane radial bearing surface bears directly against "theopposing end of the coupling member 2a when the union is assembled, asillustrated in Figure 2. j Y

In the form shown in Figure 2 the clamp nut 9a has one or more lugs 12aextending outwardly therefrom provided with openings, as [3, to receivean implement by means of which the clamp nut may be screwed home orunscrewed.

In other respects the form of union shown in Figure 2 is the same asthat shown in Figure 1 and the parts have been correspondinglyidentified by similar numerals.

Normally the metalto metal seal will prevent the escape of pressurefluid whether the coupling members are axially aligned or misaligned,but

in case they should not be in perfect contact the seal ring 6 will breakthe joint between them to prevent the escape'of pressure fluid and saidseal 3 ring is so mounted between said coupling members that it may bedistorted under the influence of fluid pressure to form a better sealirrespective of the degree of pressure inside or outside of the line.

It will be noted that the inner end of each coupling member I, la issomewhat reduced in diameter and extended and fits into a correspondingrecess in the other coupling member. This reduced extension facilitatesthe assembly of the coupling members and maintains them in properalignment until the clamp nut is screwedinto place.

What I claim is: 1

A union which comprises, in combination, a first coupling member havingat one end an outwardly curved annular external face, a second couplingmember having an inwardly flared substantially conical face so that saidflared face contacts the curved face' of said first member in an annularline'contact to form a metal-to-metal seal therewith despitemisalignment of the cou- 'pling members, said first member having anexternal annular groove inwardly adjacent said curved face with one sideof said groove connecting tangentially with said curved face to form asmooth continuous wall therewith and having its other side extendingaway from the longitudinal axis of said first member to form an 7undercut portion for retaining a seal ring in said groove uponseparation of the first and second members, said groove being disposedto face to- Ward said flared face so that when said coupling members arejoined together the flared face of 7 said second coupling member andsaid wall converge from said groove to an apex situated at saidmetal-to-metal seal thereby forming an annular space which is V-shapedin cross-section, a resilient O-ring disposed in said groove with aportion of the periphery of the O-ring in contact with the wall of saidgroove and an opposite portion in contact with said flared face, saidO-ring being uniformly circular in cross-section and of across-sectional diameter sufficiently large that with the couplingmembers joined together the O-ring is in sealing contact with saidgroove and said flared face with the latter urging the O-ring into itssealing contact with said groove, the O- ring bridging between saidmembers across the base of said V-shaped space, and means for securingsaid coupling members together.

DANIEL J. PARMESAN.

References Cited inthe file of this patent UNITEDSTATES PATENTS NumberName Date 571,762 Hayes Nov. 24, 1896 966,870 Stoddard Aug. 9, 19101,563,836 Copp Dec. 1, 1925 1,924,657 Saine et a1. Aug. 29, 19332,208,353 Woolley et al July 16, 1940 2,493,996 Parmesan Jan. 10, 19502,523,995 Parmesan Sept. 26, 1950 FOREIGN PATENTS Number Country Date204,900 Great Britain Oct. 11, 1923

